import dataclasses
import json
import marshal
import pickle
import re
import tempfile
from abc import ABC, abstractmethod
from datetime import datetime
from io import BytesIO
from typing import Any

import lxml.etree
import pytest
from itemadapter import ItemAdapter

from scrapy.exporters import (
    BaseItemExporter,
    CsvItemExporter,
    JsonItemExporter,
    JsonLinesItemExporter,
    MarshalItemExporter,
    PickleItemExporter,
    PprintItemExporter,
    PythonItemExporter,
    XmlItemExporter,
)
from scrapy.item import Field, Item
from scrapy.utils.python import to_unicode


def custom_serializer(value):
    return str(int(value) + 2)


class MyItem(Item):
    name = Field()
    age = Field()


class CustomFieldItem(Item):
    name = Field()
    age = Field(serializer=custom_serializer)


@dataclasses.dataclass
class MyDataClass:
    name: str
    age: int


@dataclasses.dataclass
class CustomFieldDataclass:
    name: str
    age: int = dataclasses.field(metadata={"serializer": custom_serializer})


class TestBaseItemExporter(ABC):
    item_class: type = MyItem
    custom_field_item_class: type = CustomFieldItem

    def setup_method(self):
        self.i = self.item_class(name="John\xa3", age="22")
        self.output = BytesIO()
        self.ie = self._get_exporter()

    @abstractmethod
    def _get_exporter(self, **kwargs) -> BaseItemExporter:
        raise NotImplementedError

    def _check_output(self):  # noqa: B027
        pass

    def _assert_expected_item(self, exported_dict):
        for k, v in exported_dict.items():
            exported_dict[k] = to_unicode(v)
        assert self.i == self.item_class(**exported_dict)

    def _get_nonstring_types_item(self):
        return {
            "boolean": False,
            "number": 22,
            "time": datetime(2015, 1, 1, 1, 1, 1),
            "float": 3.14,
        }

    def assertItemExportWorks(self, item):
        self.ie.start_exporting()
        self.ie.export_item(item)
        self.ie.finish_exporting()
        # Delete the item exporter object, so that if it causes the output
        # file handle to be closed, which should not be the case, follow-up
        # interactions with the output file handle will surface the issue.
        del self.ie
        self._check_output()

    def test_export_item(self):
        self.assertItemExportWorks(self.i)

    def test_export_dict_item(self):
        self.assertItemExportWorks(ItemAdapter(self.i).asdict())

    def test_serialize_field(self):
        a = ItemAdapter(self.i)
        res = self.ie.serialize_field(a.get_field_meta("name"), "name", a["name"])
        assert res == "John\xa3"

        res = self.ie.serialize_field(a.get_field_meta("age"), "age", a["age"])
        assert res == "22"

    def test_fields_to_export(self):
        ie = self._get_exporter(fields_to_export=["name"])
        assert list(ie._get_serialized_fields(self.i)) == [("name", "John\xa3")]

        ie = self._get_exporter(fields_to_export=["name"], encoding="latin-1")
        _, name = next(iter(ie._get_serialized_fields(self.i)))
        assert isinstance(name, str)
        assert name == "John\xa3"

        ie = self._get_exporter(fields_to_export={"name": "名稱"})
        assert list(ie._get_serialized_fields(self.i)) == [("名稱", "John\xa3")]

    def test_field_custom_serializer(self):
        i = self.custom_field_item_class(name="John\xa3", age="22")
        a = ItemAdapter(i)
        ie = self._get_exporter()
        assert (
            ie.serialize_field(a.get_field_meta("name"), "name", a["name"])
            == "John\xa3"
        )
        assert ie.serialize_field(a.get_field_meta("age"), "age", a["age"]) == "24"


class TestPythonItemExporter(TestBaseItemExporter):
    def _get_exporter(self, **kwargs):
        return PythonItemExporter(**kwargs)

    def test_invalid_option(self):
        with pytest.raises(TypeError, match="Unexpected options: invalid_option"):
            PythonItemExporter(invalid_option="something")

    def test_nested_item(self):
        i1 = self.item_class(name="Joseph", age="22")
        i2 = {"name": "Maria", "age": i1}
        i3 = self.item_class(name="Jesus", age=i2)
        ie = self._get_exporter()
        exported = ie.export_item(i3)
        assert isinstance(exported, dict)
        assert exported == {
            "age": {"age": {"age": "22", "name": "Joseph"}, "name": "Maria"},
            "name": "Jesus",
        }
        assert isinstance(exported["age"], dict)
        assert isinstance(exported["age"]["age"], dict)

    def test_export_list(self):
        i1 = self.item_class(name="Joseph", age="22")
        i2 = self.item_class(name="Maria", age=[i1])
        i3 = self.item_class(name="Jesus", age=[i2])
        ie = self._get_exporter()
        exported = ie.export_item(i3)
        assert exported == {
            "age": [{"age": [{"age": "22", "name": "Joseph"}], "name": "Maria"}],
            "name": "Jesus",
        }
        assert isinstance(exported["age"][0], dict)
        assert isinstance(exported["age"][0]["age"][0], dict)

    def test_export_item_dict_list(self):
        i1 = self.item_class(name="Joseph", age="22")
        i2 = {"name": "Maria", "age": [i1]}
        i3 = self.item_class(name="Jesus", age=[i2])
        ie = self._get_exporter()
        exported = ie.export_item(i3)
        assert exported == {
            "age": [{"age": [{"age": "22", "name": "Joseph"}], "name": "Maria"}],
            "name": "Jesus",
        }
        assert isinstance(exported["age"][0], dict)
        assert isinstance(exported["age"][0]["age"][0], dict)

    def test_nonstring_types_item(self):
        item = self._get_nonstring_types_item()
        ie = self._get_exporter()
        exported = ie.export_item(item)
        assert exported == item


class TestPythonItemExporterDataclass(TestPythonItemExporter):
    item_class = MyDataClass
    custom_field_item_class = CustomFieldDataclass


class TestPprintItemExporter(TestBaseItemExporter):
    def _get_exporter(self, **kwargs):
        return PprintItemExporter(self.output, **kwargs)

    def _check_output(self):
        self._assert_expected_item(
            eval(self.output.getvalue())  # pylint: disable=eval-used
        )


class TestPprintItemExporterDataclass(TestPprintItemExporter):
    item_class = MyDataClass
    custom_field_item_class = CustomFieldDataclass


class TestPickleItemExporter(TestBaseItemExporter):
    def _get_exporter(self, **kwargs):
        return PickleItemExporter(self.output, **kwargs)

    def _check_output(self):
        self._assert_expected_item(pickle.loads(self.output.getvalue()))

    def test_export_multiple_items(self):
        i1 = self.item_class(name="hello", age="world")
        i2 = self.item_class(name="bye", age="world")
        f = BytesIO()
        ie = PickleItemExporter(f)
        ie.start_exporting()
        ie.export_item(i1)
        ie.export_item(i2)
        ie.finish_exporting()
        del ie  # See the first “del self.ie” in this file for context.
        f.seek(0)
        assert self.item_class(**pickle.load(f)) == i1
        assert self.item_class(**pickle.load(f)) == i2

    def test_nonstring_types_item(self):
        item = self._get_nonstring_types_item()
        fp = BytesIO()
        ie = PickleItemExporter(fp)
        ie.start_exporting()
        ie.export_item(item)
        ie.finish_exporting()
        del ie  # See the first “del self.ie” in this file for context.
        assert pickle.loads(fp.getvalue()) == item


class TestPickleItemExporterDataclass(TestPickleItemExporter):
    item_class = MyDataClass
    custom_field_item_class = CustomFieldDataclass


class TestMarshalItemExporter(TestBaseItemExporter):
    def _get_exporter(self, **kwargs):
        self.output = tempfile.TemporaryFile()
        return MarshalItemExporter(self.output, **kwargs)

    def _check_output(self):
        self.output.seek(0)
        self._assert_expected_item(marshal.load(self.output))

    def test_nonstring_types_item(self):
        item = self._get_nonstring_types_item()
        item.pop("time")  # datetime is not marshallable
        fp = tempfile.TemporaryFile()
        ie = MarshalItemExporter(fp)
        ie.start_exporting()
        ie.export_item(item)
        ie.finish_exporting()
        del ie  # See the first “del self.ie” in this file for context.
        fp.seek(0)
        assert marshal.load(fp) == item


class TestMarshalItemExporterDataclass(TestMarshalItemExporter):
    item_class = MyDataClass
    custom_field_item_class = CustomFieldDataclass


class TestCsvItemExporter(TestBaseItemExporter):
    def _get_exporter(self, **kwargs):
        self.output = tempfile.TemporaryFile()
        return CsvItemExporter(self.output, **kwargs)

    def assertCsvEqual(self, first, second, msg=None):
        def split_csv(csv):
            return [
                sorted(re.split(r"(,|\s+)", line))
                for line in to_unicode(csv).splitlines(True)
            ]

        assert split_csv(first) == split_csv(second), msg

    def _check_output(self):
        self.output.seek(0)
        self.assertCsvEqual(
            to_unicode(self.output.read()), "age,name\r\n22,John\xa3\r\n"
        )

    def assertExportResult(self, item, expected, **kwargs):
        fp = BytesIO()
        ie = CsvItemExporter(fp, **kwargs)
        ie.start_exporting()
        ie.export_item(item)
        ie.finish_exporting()
        del ie  # See the first “del self.ie” in this file for context.
        self.assertCsvEqual(fp.getvalue(), expected)

    def test_header_export_all(self):
        self.assertExportResult(
            item=self.i,
            fields_to_export=ItemAdapter(self.i).field_names(),
            expected=b"age,name\r\n22,John\xc2\xa3\r\n",
        )

    def test_header_export_all_dict(self):
        self.assertExportResult(
            item=ItemAdapter(self.i).asdict(),
            expected=b"age,name\r\n22,John\xc2\xa3\r\n",
        )

    def test_header_export_single_field(self):
        for item in [self.i, ItemAdapter(self.i).asdict()]:
            self.assertExportResult(
                item=item,
                fields_to_export=["age"],
                expected=b"age\r\n22\r\n",
            )

    def test_header_export_two_items(self):
        for item in [self.i, ItemAdapter(self.i).asdict()]:
            output = BytesIO()
            ie = CsvItemExporter(output)
            ie.start_exporting()
            ie.export_item(item)
            ie.export_item(item)
            ie.finish_exporting()
            del ie  # See the first “del self.ie” in this file for context.
            self.assertCsvEqual(
                output.getvalue(), b"age,name\r\n22,John\xc2\xa3\r\n22,John\xc2\xa3\r\n"
            )

    def test_header_no_header_line(self):
        for item in [self.i, ItemAdapter(self.i).asdict()]:
            self.assertExportResult(
                item=item,
                include_headers_line=False,
                expected=b"22,John\xc2\xa3\r\n",
            )

    def test_join_multivalue(self):
        class TestItem2(Item):
            name = Field()
            friends = Field()

        for cls in TestItem2, dict:
            self.assertExportResult(
                item=cls(name="John", friends=["Mary", "Paul"]),
                include_headers_line=False,
                expected='"Mary,Paul",John\r\n',
            )

    def test_join_multivalue_not_strings(self):
        self.assertExportResult(
            item={"name": "John", "friends": [4, 8]},
            include_headers_line=False,
            expected='"[4, 8]",John\r\n',
        )

    def test_nonstring_types_item(self):
        self.assertExportResult(
            item=self._get_nonstring_types_item(),
            include_headers_line=False,
            expected="22,False,3.14,2015-01-01 01:01:01\r\n",
        )

    def test_errors_default(self):
        with pytest.raises(UnicodeEncodeError):
            self.assertExportResult(
                item={"text": "W\u0275\u200brd"},
                expected=None,
                encoding="windows-1251",
            )

    def test_errors_xmlcharrefreplace(self):
        self.assertExportResult(
            item={"text": "W\u0275\u200brd"},
            include_headers_line=False,
            expected="W&#629;&#8203;rd\r\n",
            encoding="windows-1251",
            errors="xmlcharrefreplace",
        )


class TestCsvItemExporterDataclass(TestCsvItemExporter):
    item_class = MyDataClass
    custom_field_item_class = CustomFieldDataclass


class TestXmlItemExporter(TestBaseItemExporter):
    def _get_exporter(self, **kwargs):
        return XmlItemExporter(self.output, **kwargs)

    def assertXmlEquivalent(self, first, second, msg=None):
        def xmltuple(elem):
            children = list(elem.iterchildren())
            if children:
                return [(child.tag, sorted(xmltuple(child))) for child in children]
            return [(elem.tag, [(elem.text, ())])]

        def xmlsplit(xmlcontent):
            doc = lxml.etree.fromstring(xmlcontent)
            return xmltuple(doc)

        assert xmlsplit(first) == xmlsplit(second), msg

    def assertExportResult(self, item, expected_value):
        fp = BytesIO()
        ie = XmlItemExporter(fp)
        ie.start_exporting()
        ie.export_item(item)
        ie.finish_exporting()
        del ie  # See the first “del self.ie” in this file for context.
        self.assertXmlEquivalent(fp.getvalue(), expected_value)

    def _check_output(self):
        expected_value = (
            b'<?xml version="1.0" encoding="utf-8"?>\n'
            b"<items><item><age>22</age><name>John\xc2\xa3</name></item></items>"
        )
        self.assertXmlEquivalent(self.output.getvalue(), expected_value)

    def test_multivalued_fields(self):
        self.assertExportResult(
            self.item_class(name=["John\xa3", "Doe"], age=[1, 2, 3]),
            b"""<?xml version="1.0" encoding="utf-8"?>\n
            <items>
                <item>
                    <name><value>John\xc2\xa3</value><value>Doe</value></name>
                    <age><value>1</value><value>2</value><value>3</value></age>
                </item>
            </items>
            """,
        )

    def test_nested_item(self):
        i1 = {"name": "foo\xa3hoo", "age": "22"}
        i2 = {"name": "bar", "age": i1}
        i3 = self.item_class(name="buz", age=i2)

        self.assertExportResult(
            i3,
            b"""<?xml version="1.0" encoding="utf-8"?>\n
                <items>
                    <item>
                        <age>
                            <age>
                                <age>22</age>
                                <name>foo\xc2\xa3hoo</name>
                            </age>
                            <name>bar</name>
                        </age>
                        <name>buz</name>
                    </item>
                </items>
            """,
        )

    def test_nested_list_item(self):
        i1 = {"name": "foo"}
        i2 = {"name": "bar", "v2": {"egg": ["spam"]}}
        i3 = self.item_class(name="buz", age=[i1, i2])

        self.assertExportResult(
            i3,
            b"""<?xml version="1.0" encoding="utf-8"?>\n
                <items>
                    <item>
                        <age>
                            <value><name>foo</name></value>
                            <value><name>bar</name><v2><egg><value>spam</value></egg></v2></value>
                        </age>
                        <name>buz</name>
                    </item>
                </items>
            """,
        )

    def test_nonstring_types_item(self):
        item = self._get_nonstring_types_item()
        self.assertExportResult(
            item,
            b"""<?xml version="1.0" encoding="utf-8"?>\n
                <items>
                   <item>
                       <float>3.14</float>
                       <boolean>False</boolean>
                       <number>22</number>
                       <time>2015-01-01 01:01:01</time>
                   </item>
                </items>
            """,
        )


class TestXmlItemExporterDataclass(TestXmlItemExporter):
    item_class = MyDataClass
    custom_field_item_class = CustomFieldDataclass


class TestJsonLinesItemExporter(TestBaseItemExporter):
    _expected_nested: Any = {
        "name": "Jesus",
        "age": {"name": "Maria", "age": {"name": "Joseph", "age": "22"}},
    }

    def _get_exporter(self, **kwargs):
        return JsonLinesItemExporter(self.output, **kwargs)

    def _check_output(self):
        exported = json.loads(to_unicode(self.output.getvalue().strip()))
        assert exported == ItemAdapter(self.i).asdict()

    def test_nested_item(self):
        i1 = self.item_class(name="Joseph", age="22")
        i2 = {"name": "Maria", "age": i1}
        i3 = self.item_class(name="Jesus", age=i2)
        self.ie.start_exporting()
        self.ie.export_item(i3)
        self.ie.finish_exporting()
        del self.ie  # See the first “del self.ie” in this file for context.
        exported = json.loads(to_unicode(self.output.getvalue()))
        assert exported == self._expected_nested

    def test_extra_keywords(self):
        self.ie = self._get_exporter(sort_keys=True)
        self.test_export_item()
        self._check_output()
        with pytest.raises(TypeError):
            self._get_exporter(foo_unknown_keyword_bar=True)

    def test_nonstring_types_item(self):
        item = self._get_nonstring_types_item()
        self.ie.start_exporting()
        self.ie.export_item(item)
        self.ie.finish_exporting()
        del self.ie  # See the first “del self.ie” in this file for context.
        exported = json.loads(to_unicode(self.output.getvalue()))
        item["time"] = str(item["time"])
        assert exported == item


class TestJsonLinesItemExporterDataclass(TestJsonLinesItemExporter):
    item_class = MyDataClass
    custom_field_item_class = CustomFieldDataclass


class TestJsonItemExporter(TestJsonLinesItemExporter):
    _expected_nested = [TestJsonLinesItemExporter._expected_nested]

    def _get_exporter(self, **kwargs):
        return JsonItemExporter(self.output, **kwargs)

    def _check_output(self):
        exported = json.loads(to_unicode(self.output.getvalue().strip()))
        assert exported == [ItemAdapter(self.i).asdict()]

    def assertTwoItemsExported(self, item):
        self.ie.start_exporting()
        self.ie.export_item(item)
        self.ie.export_item(item)
        self.ie.finish_exporting()
        del self.ie  # See the first “del self.ie” in this file for context.
        exported = json.loads(to_unicode(self.output.getvalue()))
        assert exported == [ItemAdapter(item).asdict(), ItemAdapter(item).asdict()]

    def test_two_items(self):
        self.assertTwoItemsExported(self.i)

    def test_two_dict_items(self):
        self.assertTwoItemsExported(ItemAdapter(self.i).asdict())

    def test_two_items_with_failure_between(self):
        i1 = MyItem(name="Joseph\xa3", age="22")
        i2 = MyItem(
            name="Maria", age=1j
        )  # Invalid datetimes didn't consistently fail between Python versions
        i3 = MyItem(name="Jesus", age="44")
        self.ie.start_exporting()
        self.ie.export_item(i1)
        with pytest.raises(TypeError):
            self.ie.export_item(i2)
        self.ie.export_item(i3)
        self.ie.finish_exporting()
        exported = json.loads(to_unicode(self.output.getvalue()))
        assert exported == [dict(i1), dict(i3)]

    def test_nested_item(self):
        i1 = self.item_class(name="Joseph\xa3", age="22")
        i2 = self.item_class(name="Maria", age=i1)
        i3 = self.item_class(name="Jesus", age=i2)
        self.ie.start_exporting()
        self.ie.export_item(i3)
        self.ie.finish_exporting()
        del self.ie  # See the first “del self.ie” in this file for context.
        exported = json.loads(to_unicode(self.output.getvalue()))
        expected = {
            "name": "Jesus",
            "age": {"name": "Maria", "age": ItemAdapter(i1).asdict()},
        }
        assert exported == [expected]

    def test_nested_dict_item(self):
        i1 = {"name": "Joseph\xa3", "age": "22"}
        i2 = self.item_class(name="Maria", age=i1)
        i3 = {"name": "Jesus", "age": i2}
        self.ie.start_exporting()
        self.ie.export_item(i3)
        self.ie.finish_exporting()
        del self.ie  # See the first “del self.ie” in this file for context.
        exported = json.loads(to_unicode(self.output.getvalue()))
        expected = {"name": "Jesus", "age": {"name": "Maria", "age": i1}}
        assert exported == [expected]

    def test_nonstring_types_item(self):
        item = self._get_nonstring_types_item()
        self.ie.start_exporting()
        self.ie.export_item(item)
        self.ie.finish_exporting()
        del self.ie  # See the first “del self.ie” in this file for context.
        exported = json.loads(to_unicode(self.output.getvalue()))
        item["time"] = str(item["time"])
        assert exported == [item]


class TestJsonItemExporterToBytes(TestBaseItemExporter):
    def _get_exporter(self, **kwargs):
        kwargs["encoding"] = "latin"
        return JsonItemExporter(self.output, **kwargs)

    def test_two_items_with_failure_between(self):
        i1 = MyItem(name="Joseph", age="22")
        i2 = MyItem(name="\u263a", age="11")
        i3 = MyItem(name="Jesus", age="44")
        self.ie.start_exporting()
        self.ie.export_item(i1)
        with pytest.raises(UnicodeEncodeError):
            self.ie.export_item(i2)
        self.ie.export_item(i3)
        self.ie.finish_exporting()
        exported = json.loads(to_unicode(self.output.getvalue(), encoding="latin"))
        assert exported == [dict(i1), dict(i3)]


class TestJsonItemExporterDataclass(TestJsonItemExporter):
    item_class = MyDataClass
    custom_field_item_class = CustomFieldDataclass


class TestCustomExporterItem:
    item_class: type = MyItem

    def setup_method(self):
        if self.item_class is None:
            pytest.skip("item class is None")

    def test_exporter_custom_serializer(self):
        class CustomItemExporter(BaseItemExporter):
            def serialize_field(self, field, name, value):
                if name == "age":
                    return str(int(value) + 1)
                return super().serialize_field(field, name, value)

            def export_item(self, item: Any) -> None:
                pass

        i = self.item_class(name="John", age="22")
        a = ItemAdapter(i)
        ie = CustomItemExporter()

        assert ie.serialize_field(a.get_field_meta("name"), "name", a["name"]) == "John"
        assert ie.serialize_field(a.get_field_meta("age"), "age", a["age"]) == "23"

        i2 = {"name": "John", "age": "22"}
        assert ie.serialize_field({}, "name", i2["name"]) == "John"
        assert ie.serialize_field({}, "age", i2["age"]) == "23"


class TestCustomExporterDataclass(TestCustomExporterItem):
    item_class = MyDataClass
